Reference work entry
Cleavage is a type of planar rock feature with a thin, dense and potentially fractured structure that develops as a result of splitting induced by rock deformation. Non-deformed cleavage has straight planar surfaces with very strong ‘cleavability’. Based on its orientation, cleavage can be categorised as axial-plane cleavage, bedding cleavage and fan cleavage; and based on its continuity, it can be divided into continuous cleavage and discontinuous cleavage. According to the formation mechanism, it can be divided into fracture cleavage, flow cleavage and crenulation cleavage; whereas this is the most common classification method (Fig. 36).
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